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Written by Oleksandr Gavenko (AKA gavenkoa), compiled on 2020-11-21 from rev ebbf146d86c1+.

Web accessibility.

Check tools.

http://wave.webaim.org
On-line checker. Report accessibility errors and warnings.
https://validator.w3.org/
Check the markup (HTML, XHTML, …) of Web documents.
http://caniuse.com/
Up-to-date browser support tables.